Update redis requirement from ~> 3.3 to >= 3.3, < 5.0
Update redis requirement from ~> 3.3 to >= 3.3, < 5.0

Updates the requirements on [redis](https://github.com/redis/redis-rb) to permit the latest version.
- [Release notes](https://github.com/redis/redis-rb/releases)
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/redis/redis-rb/commits/v3.3.5)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sensu-plugins/sensu-plugins-redis